Safety device for power squaring-shears and similar machine.



(a. w. RANK &. P. M. HO FFMA NN. SAFETY DEVICE FOR POWER SQUARINGSH'EARS AND SIMILAR MACHINES.

APPLICATION FILED NOV. I4. 19M.

Patented J m 11, 1916.

. 2 SHIZETS-SHIEET I "EH5 will w I I n Quiet/mu o G. W. RANK & P.M..HOFFMANN. SAFETY DEVICE FOR POWER SQUARING SHEARS AND SIMILARMACHINES.

APPLICATION FILED NOV. l4. 19M.

Ru 1 m YT. 1 fl 4 Jim .1 dun Jo es R my .1 e t a P II A WWW Q Q UBVQK'dee ro,

v United States, residing at lndianapolis 9'5 invented and.

.Power Sonar; ch nes, ofwhich the following isa specifi- I 'andi its'objectlis to provide means whereby the" operator of the tected a g ainstinjury enoieehw; sane: mp rising rat; 1 norm raiser,

iiiifEs i rann'r ot;

or mnmneroms, N IANA.

sernrr 'msvron roe rowan seuanine sniiens .Anio" sr'ivrrtim 11: scarInns a nc e n filed November 1 To aZhbhomz't mag concemr j Be it knownthat we, GEQRGE'WL'RANK and PHILIP M; lloriuaa'nn,

citizens of the Marion-county and State of Indiana, have discoveredcertain new and useful Improvements in Safety Devices for 'ng-Shears andSimilar Ma cation. I

Qur inyent'ionre'latesto s fety devices for] power squaring shears andsimilar/machine's;

inachinelwill be pm by the shearing blade? To this end our invention isembodied in] preferable form in the attachment herein after describedand illustrated 'in'the'accom panying drawings; 3;

. In these drawings, Figiire l is a fr oht,

- view in elevation of apower squamngshears with our inventionapplied-thereto; F g.-.2, I sectional end View on the line 2-2- o i1;Fig. 3," a horiaont'al section onthe'linefi tion -on the line 5 -5 of Qtail section on the line Fig. 7, a sectioned/the line 7+7 of Fig. 3.

3- 3 of Figs..1 and Q'yliig. asectiononf the line .l l of Fig.1; Fig; 5,adetail sec-. Fig. 3; Fig. 6, a de-- 6- 6 of Fig. 5 and Referring to thedrawings; 1 is the frame" of a power-squaring shears, 2 a verticallyreciprocating shear blade'and 3 the bed on which the work, such as asheet of metal is adapted to be placed. in. machines of t is class asheet of metal is adapted to be placed upon the work bed and movedforward by the hands of the operator until it is positioned on the bedunder the blade at the line where it is desired to cut the sheet.

and frequently the operator. ih the'operation of the machine, that astheThe" operator then throws thedriving means into engagement with theactuating mechanism a: the blade by operatinga clutch through a footpedal, and thereupon the blade is forced down throughthe sheet ofmetahand then the sheet is withdrawn by hand and another onesubstituted. In the operation of such machines it is necessary for theoper- 'ator to advance hishands close to the cutting blade is. bothplacing and withdrawing the work. 'This is a dangerous operation resultsin serious injury to It also frequently happens,

" ie is being raised the clutch between the madeioperating mechanism andthe driving "and'the work 7, known as a specimen; ofLetters rarest. pmiit J ly 1 1916;

4; 1914, semi to. $72,123.

Whiletheoperator is still attempting to 'Uur invention aims to guardagainst the- .occurrence of accidents of the above kindhy providingmeans for holding the clutch -niechanism positively out of engagement'means is thrown into engagement, thus I causing the blade'to repeat itsoperation until the same-1s again operated by the direct application ofthe foot of the operator to the pedal levergand also to-provide meansfor preventing the entrance of the fingers or the operator between theshearing blade during the cutting operation.

The shearing blade is adapted to hereciprocated vertically by rods 4:,which are operated by eccentrics 5 on a shaft 6, eX-' tending a-orossthe machine." Theshaft 6 isendwith a large gear wheel provided at onebull wheel, which is driven by a gear 8, mounted on the end-of a drivingshaft 9. This hull wheel is mounted loosely on the shaft 6 and isadapted to be positively connected theretoby means oi a suitable clutch'mechanism.. mechanism shown in the drawings is of the form usuallyemployed in power. squaring shears and comprises a spring pressed pin10mounted in a socket 11 in a collar 12 which is fixed upon the shaft 6,and the end of which pin is constantly forced outward by a spiral spring13 mounted within the socket, The outer end of the pin is adapted toengage either one of two recesses. 14c formed in the hull wheel. Whenthe pin is forced outwardly by its spring into one of the recesses,

connected to the collar and hence the shaft The clutch the bull wheelwill 'be'fixedly 6 will be driven through the driving connection betweenthe gears 8 and 7.

The pin 13 is held normally out of engagement with the hull wheel by theend of the arm 15 of a bell crank lever detent, the outer end of whichis beveled. and is adapted to project into a circumferential slot 16 cutin the hub'of the bull wheel. When the arm is depressed, it holds'thepin out of engagement with the wheel and when raised, it permits saidpin to establish automatically a driving connectionbetween the hullwheel and shaft. This controlling detent is connected to and operatedby. the foot treadle, as is usual, and to this end 1 into the recess Cla suflicient tension willhave been imposed.

on the spring 2i snap the arm out of the path of the pin 13 andpermit-ting said clutch pin .to engage m5 before the end of the slotl9reaches the- .After the cutting. operation has member,

. pin 18.

until it strikes the stop 44. @The guard is set to move down to theupper line of the Work of the .maximum thickness that the machine isadapted to accommodate. This condition notonly prevents the entrance ofthe fingers of the operator between the bed and blade but also serves toprevent the operation of the machine when a plate of excess thickness isattempted to be inserted between the blade; and bed. At the same timethe arm 30 of the first bell crank member will carrythe latch bar 26 totheleft, releasing the under face of the bar from engagement with thearm 15 of'the clutch detent bell crank, whereby the de'te'nt will slipall by the reduced toe 28, f i t will be in unlocked positio ready t9 beoperated to release the pin 13. Owing to the relative iengths of travelof the latchbar and guard .the former will not be released from thedetentun'til the guard, member has moved down to its limit of travel. Assoon as the latch bar has releasedthe detent 15,

so that sa d to rock the arm 17 and with-the bull Wheel whereuponthelatter 1S locked to the shaft 6' and said shaft will be operated'soas to rotate the eccentrics 5 and carry downward the shearing blade 2 toperform the cutting operation. The spring 24: serves to give a quickmovement to the arm been performed and the'blade again raised "to itsuppermost position, theffoot treadle is released whereupon springs -16will carry 7 position and clutch pin safely 1n said treadle and theconnected parts 21 and 20 and-the bell crank 17- 15 back to normal assoon as the. arm 15 has been alinement with the clutch pin itsrevolution will ride moved into 13, said clutch pin'in against theinclined part of the end of the arm 15 and: be retracted so as torelease the bull wheel. The rod 36 will be carried up wardly by thereturn spring36' and as the lower end of the slot 35 in said rodcontacts 7 the bell crank 3130 will throw the latch bar 26 to the detentlever 15* with the pin 32, berocked so as to the right and abovewhiclrhas been previously thrown down into detaining position, thuslocking the preventing the arm I tally raised bythe jarring ofthemachine ancl consequently preventing the accidental 13 with the bullengagement of the pin.

. wheel, .thus avoiding the liability of an imar bla e. The

er repeat operation of the "shearing uard member 41 will he carriednpward by spring 36', If desired, the

This member will movedown' .the operator.

. Whatvve claim is eratingmechanism i of the latch upon work supplied toretracted position and 15 from being acciden-- clutch loc'kingmechanismmay be employed without theuse of the guard member 41, but, of course,the latter is a highlyjimpon tantfeature in the prevention of injury toHaving. thus. described our invention,

1. In combination with. ing a member to be driven for operation uponwork supplied to the machine, operating mechanisnr a machineincl'ud-.

for said member, dr1ving means for said'operating mechanisnn-a drivingmeans and opclutch between said a detent for holding crating mechanism,

', said' clutch out of engagement, a locking member for said detentautomatically movable into position-to locksaid detent in clutchdetaining position, a single common foot operated member for operatingboth said detent and said locking member in'the same movement of theoperating member and means of connection between said operating memberandsaid detent and locking member-permitting the operation of the latterbefore the operation of the detent and means for automatically andsuccessively restoring the detent and 'locki-ngmember tov lockingpositions.

'2.v In combination with. a machineinclud ing. a member to be ing meansfor said operating mechanism, a

driven for operation upon work supplied; to ,the machine, ofpfor saidmember, driv clutchbetween said driving means and said operatingmechanism, said clutch including a" spring pressed automatically engagmgclutch pin, a pivoted detent for holding said clutch pin normally outofclutching engagement, a slidinglatch bar adapted to bear against saiddetent for locking it in detaining position, an operating foot treadleunder the control of the operator ofthe machine, operative connectionsbetween said operating, treadle and the locking member and detentrespectively, said locking member connection permitting the Withdrawalbar fromthe detent preliminarily to the withdrawalfof the detent fromthe clutch pin, and means for successively and automatically restoringthe detent and latch bar to locking positions. v

3. In combination with machine including a member to be drivenforoperation tive mechanism for said member, driving the machine, operameans for said operating mechanism, a.

spring pressed automatically clutch pin between said driving means andoperating mechanism, a pivoted, detent for holding said clut h out ofengagement, a

engaging sliding latch bar for locking said detent in t detainingposition, a #conne'ction between said'treadle and said locking latch barfor retracting thelatter, and a' 'spring and a .-los t motion connectionbetween said treadle,

and said detent whereby said detent will be operated only after thelatch bar has been ithdrawn and after tension has been im: posed uponsaid spring by the movement of the trcadle.

d. In combination with a machine including a .part to be driven foroperation upon work supplied to the machine, mechanism for operatingsaid part, driving means, a clutch intermediate said driving means andoperating mechanism, a detent for holding said clutch out of operativepositiom-a locking latch bar adapted to engage said do tent, a treadlefor operating said detent and latch bar, an operating link, means ofconnection between said link and latch bar work bed, operating mechanismfor the blade, driving): means, a clutch between said mechanism andmeans, a detent for holding said clutch out of operation, a lockingmember for holding said dctent in clutch detaining position, a treadlc,and means of opcrative connection betwcon said trcadle and the guardmember, detcnt and locking member respectively, substantially asdescribed. (3. In combination with a machine including: a member to bedriven for operation' upon worlt supplied to the machine, a work had. aguard member mounted in front of thc driven mm'ubc and movable towardand from said wru'k bed, driving means for said driwn worl; member, acontrolling member 'l'or thinning; said driving means into operativeconnection with the driven member, means oi operative connection betweensaid controlling: mcmbcr and the guard member operable to hold the guardmember constautlv down. in guarding position during the successivemovements of the driven and a lost motion and flexible connection be-'member in a continuous operation of the machine.

7. In combination with a machine including a member to be driven foroperation on work supplied to the machine, driving means for saidmember, a controlling member for establishing a connection between saiddriving means and said driven member, a work bed, a guard member mountedadjacent to the driven member and movable toward and from the bed, meansoi. operative connection between the controlling member and said guardmember for moving thc'guard member into guarding position when thecontrolling member is actuated, said connecting means holding; thetguard member down in operative position during successive movements oithe driven member,

when the machine continuously operated and means for limiting thedowmvard movement of the guard toward the bedto a line spaced above thework to thereby permit the repeated insertion of worl: under the guardmember while the same is in guarding position.

8. In combination with a machine including' a member to be driven foroperation upon work supplied to the machine, driving means for saiddriven member, a trcadle, a clutch between the treadle and drivingunans, a detent for holding said clutch out of operation and havingmeans of conncction with the trcadle whereby the detent is held out ofdetaining position with respect to the clutch while the trcadle isdepressed and a guard member mounted adjacent to the driven mcrnbe andmeans of connection between the treadle and said guard member adapted tohold the guard member down in guarding position while the treadle is depresse In witness whereof, we have hereunto set our hands and seals atIndianapolis, Indiana, this 11th day of November A. 1)., nineteenhundred and fourteen.

GEORGE W. RANK. [It s] THILIP M. HOFFMANN. [Ls] \Vitncsses A. (l. Rice,ll. 1. Doonrrrmz.

